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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Chi-hun O | 2020-2023 | .000 | 0 | 0 | 0 | 2 | 0 | 3.18 | 8 |
| Gerald O'Collins | 2026-2027 | .227 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Gary O'Herlihy | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 6.75 | 0 |
| William O'Keefe | 2026-2027 | .361 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Tim O'Neal | 2029-2029 | .306 | 3 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Johnny O'Quinn | 2031-2031 | .000 | 0 | 0 | 1 | 2 | 2 | 5.00 | 24 |
| Will O'Slattery | 2022-2023 | .000 | 0 | 0 | 7 | 10 | 15 | 3.52 | 107 |
| Dale O'Sullivan | 2020-2020 | .204 | 2 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Ricky O'Toole | 2029-2029 | .000 | 0 | 0 | 0 | 0 | 0 | 7.27 | 7 |
| Ezequiel Oacia | 2031-2031 | .140 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Goodluck Obasanjo | 2028-2028 | .000 | 0 | 0 | 8 | 9 | 0 | 2.70 | 137 |
| Ramón Ocegueda | 2027-2028 | .000 | 0 | 0 | 3 | 0 | 3 | 0.84 | 48 |
| Robert Emmet Odlum | 2024-2024 | .298 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Hildo Oerlemans | 2030-2030 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Hirohisa Ogasawara | 2027-2027 | .288 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Oglander | 2022-2023 | .204 | 0 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Robby Oglethorpe | 2028-2029 | .000 | 0 | 0 | 4 | 19 | 0 | 5.79 | 199 |
| Ralph Ogstoun | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 0.90 | 5 |
| Akihiko Oike | 2026-2026 | .333 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Idowu Okonjo | 2028-2029 | .000 | 0 | 0 | 0 | 2 | 1 | 3.03 | 39 |
| Takechi Okubo | 2026-2027 | .256 | 16 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Oliva | 2027-2028 | .244 | 3 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Álex Olivarez | 2021-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 4.76 | 2 |
| Robert Olson | 2022-2023 | .000 | 0 | 0 | 0 | 1 | 0 | 3.52 | 10 |
| Doppo Omikado | 2026-2028 | .000 | 0 | 0 | 13 | 7 | 47 | 1.68 | 243 |
| Tzu-hsia Ong | 2026-2028 | .000 | 0 | 0 | 10 | 6 | 0 | 2.59 | 160 |
| Milan Opalka | 2030-2030 | .000 | 0 | 0 | 1 | 0 | 0 | 2.25 | 10 |
| Juan Ordóńez | 2024-2026 | .000 | 0 | 0 | 21 | 21 | 0 | 3.87 | 265 |
| José Orihvela | 2026-2028 | .287 | 2 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Aurelio Ornelas | 2026-2029 | .000 | 0 | 0 | 3 | 1 | 5 | 1.53 | 41 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Román Ornelas | 2030-2030 | .000 | 0 | 0 | 3 | 4 | 21 | 1.31 | 62 |
| Germán Orozco | 2021-2023 | .000 | 0 | 0 | 5 | 0 | 5 | 3.08 | 32 |
| Jesús Orozco | 2025-2025 | .000 | 0 | 0 | 3 | 1 | 2 | 2.28 | 40 |
| Mike Orrsborne | 2029-2031 | .000 | 0 | 0 | 11 | 9 | 7 | 3.93 | 174 |
| Curt Orser | 2031-2031 | .000 | 0 | 0 | 4 | 4 | 9 | 2.41 | 51 |
| António Ortega | 2031-2031 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| David Ortega | 2020-2022 | .250 | 4 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Ortíz | 2029-2031 | .000 | 0 | 0 | 11 | 8 | 10 | 2.54 | 159 |
| Armando Ortíz | 2026-2026 | .000 | 0 | 0 | 5 | 2 | 0 | 2.01 | 61 |
| Carlos Ortíz | 2026-2026 | .000 | 0 | 0 | 5 | 1 | 0 | 4.83 | 48 |
| Cisco Ortíz | 2024-2024 | .000 | 0 | 0 | 10 | 3 | 0 | 2.14 | 137 |
| Cristián Ortíz | 2030-2031 | .248 | 2 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ortíz | 2031-2031 | .000 | 0 | 0 | 0 | 2 | 3 | 3.41 | 34 |
| Jesús Ortíz | 2022-2023 | .175 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Joaquín Ortíz | 2025-2025 | .000 | 0 | 0 | 0 | 1 | 1 | 8.31 | 3 |
| Jorge Ortíz | 2030-2030 | .308 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2027-2027 | .194 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2023-2024 | .000 | 0 | 0 | 13 | 18 | 0 | 2.96 | 226 |
| José Antonio Ortíz | 2026-2026 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortíz | 2030-2030 | .125 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Martin Ortíz | 2021-2023 | .000 | 0 | 0 | 0 | 0 | 2 | 6.46 | 9 |
| Pedro Ortíz | 2030-2030 | .000 | 0 | 0 | 0 | 0 | 0 | 5.06 | 7 |
| Sergio Ortíz | 2020-2020 | .250 | 4 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Ortíz | 2021-2023 | .232 | 7 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Ximena Ortíz | 2029-2029 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Orwig | 2027-2029 | .191 | 9 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Gus Osborne | 2031-2031 | .000 | 0 | 0 | 2 | 5 | 12 | 3.94 | 44 |
| Jaime Osorio | 2026-2027 | .000 | 0 | 0 | 2 | 2 | 1 | 5.12 | 23 |
| Jon Osterman | 2027-2027 | .300 | 4 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Shohei Otani | 2030-2031 | .288 | 14 | 69 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Otero | 2027-2027 | .000 | 0 | 0 | 7 | 8 | 0 | 3.19 | 126 |
| Juan Otero | 2020-2020 | .329 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Yajirobei Otomo | 2025-2025 | .000 | 0 | 0 | 1 | 2 | 1 | 2.70 | 8 |
| Peter Ough | 2028-2031 | .234 | 0 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Everton Oulton | 2028-2029 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Reino Öunap | 2030-2031 | .000 | 0 | 0 | 2 | 11 | 0 | 5.65 | 83 |
| Matt Ouweneel | 2028-2029 | .290 | 0 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Odemar Ouweneel | 2022-2022 | .000 | 0 | 0 | 5 | 2 | 2 | 3.35 | 42 |
| Kyle Overhill | 2030-2031 | .000 | 0 | 0 | 3 | 6 | 2 | 6.38 | 71 |
| Jian-gang Ow-Yang | 2024-2027 | .000 | 0 | 0 | 11 | 3 | 5 | 3.10 | 148 |
| Alfred Owen | 2029-2031 | .253 | 9 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Owens | 2024-2024 | .000 | 0 | 0 | 5 | 7 | 0 | 2.82 | 99 |
